In a parade square,
38 of the students wore vests. After 294 students who wore vests entered the parade square, the percentage of students who wore vests increased to 90%. How many students in the parade square did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
3x1 =
3 u |
5x1 =
5 u |
| Change |
+ 294 |
|
| After |
9x5 =
45 u |
1x5 =
5 u |
90% =
90100 =
910The number of students who did not wear vests remains unchanged. LCM of 5 and 1 is 5.
Number of students who wore vests and left
= 45 u - 3 u
= 42 u
42 u = 294
1 u = 294 ÷ 42 = 7
Number of students who did not wear vests
= 5 u
= 5 x 7
= 35
Answer(s): 35
